Have looked at this game in the past. Not sure if it is even worth the $2.49..........However, I read that if you purchase the game during the sale event that you get 2 copies of the game + 3 guest passes.

Now I can't confirm this as I have not purchased the game and the Steam site does not say anything regarding this either.

I have it and haven't played it, but I know some of the guys from Interwave Studios because they either previously or currently manage SourceMod (a server administration mod/plugin interface for Source engine games). I think they just added a new gamemode yesterday as well.

I doubt this is much help to you but I should probably try it out lol.